Wireless charging is nothing new, but with the new iPhone starting to support this function, its exposure will soon increase.
However, wireless charging technology is still subject to many restrictions, especially the charging range. In most cases, "wireless charger" is not a literal sense of wireless, users must contact the device and the charging board. If you remove the cell phone from the charging board, even if it is one centimeter, the charge will stop.
A company called Pi hopes to change the situation of "wireless charging without wireless". They are developing a device called Pi Charger, which can charge multiple devices within a circle of about 30 centimeters. This is not the concept that other companies spend years trying to achieve a wireless charge, but Pi provides more flexibility than a rechargeable board.